WO2023138749A1 - Vehicle lighting device - Google Patents

Vehicle lighting device Download PDF

Info

Publication number
WO2023138749A1
WO2023138749A1 PCT/EP2022/050985 EP2022050985W WO2023138749A1 WO 2023138749 A1 WO2023138749 A1 WO 2023138749A1 EP 2022050985 W EP2022050985 W EP 2022050985W WO 2023138749 A1 WO2023138749 A1 WO 2023138749A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
lighting device
vehicle lighting
section
guide element
Prior art date
Application number
PCT/EP2022/050985
Other languages
French (fr)
Inventor
Giuseppe Mattina
Willi GLATTER
Ansgar GOLLNICK
Original Assignee
Hella Saturnus Slovenija d.o.o.
HELLA GmbH & Co. KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hella Saturnus Slovenija d.o.o., HELLA GmbH & Co. KGaA filed Critical Hella Saturnus Slovenija d.o.o.
Priority to PCT/EP2022/050985 priority Critical patent/WO2023138749A1/en
Publication of WO2023138749A1 publication Critical patent/WO2023138749A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0029—Spatial arrangement
    • B60Q1/0041—Spatial arrangement of several lamps in relation to each other
    • B60Q1/0058—Stacked, i.e. one lamp located behind the other in the optical axis direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/239—Light guides characterised by the shape of the light guide plate-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/245—Light guides characterised by the emission area emitting light from one or more of its major surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255

Definitions

  • the present invention relates to a vehicle lighting device comprising a housing and a plastic cover pane covering the front opening of the housing.
  • the light-guide components In modem motor vehicle lighting devices, light-guide components are frequently used, with the particular aim of creating a homogeneous light impression over a wide area.
  • the light-guide components typically comprise a large number of expediently arranged outcoupling elements in the form of geometric scattering centers introduced into the surface, for example by means of surface structuring, etching or the like.
  • Light is usually coupled-in via a section at the rim of the light-guide components, and light guiding is typically based on the principle of total reflection.
  • Such lightguide components serve, for example, as daytime running lights, as direction indicators or also as design elements, pictograms, logos and the like.
  • the document DE 10 2020 102 602 A1 discloses a lighting unit for a vehicle lighting device, comprising an elongated light-guide component in a holding device arranged behind the transparent cover pane of the lighting unit, the light-guide component being designed to couple-out light over its longitudinal extension and to form a required light signature along a bending line.
  • the document AT 520399 A1 discloses a vehicle lighting device, comprising an elongated light-guide component, an aperture and a plate-like light-guide component arranged one after the other behind the cover pane of the lighting device.
  • the invention relates to a vehicle lighting device comprising a housing and a plastic cover pane covering the front opening of the housing, and discloses that the vehicle lighting device comprises an illuminant configured to emit light into the cover pane via a rim-sided light-incoupling section, wherein the cover pane is configured at least in sections as a light-guide element featuring a light-outcoupling section with outcoupling elements, such that light of the illuminant is emittable from the light-outcoupling section.
  • the basic idea of the invention lies in the use of the plastic cover pane itself as the light-guide component of the vehicle lighting device. This eliminates the need for separate light-guide components as known from the prior art.
  • the construction of the vehicle lighting device can thus be made more compact and there is greater freedom with regard to the technical configuration and design aspects. Moreover, the assembly process of the vehicle lighting device can be carried out more quickly due to the smaller number of components to be assembled with each other, which is a major economic advantage for mass-produced devices.
  • the cover pane serves to protect the interior of the housing, in which the lighting modules are housed, from the ingress of water, dust, dirt and the like.
  • it functions at least in sections as a light-guide element, i.e. , as a light-guiding and light-emitting component, for which purpose suitable light-incoupling and light-outcoupling sections must be provided.
  • the light-incoupling section is formed by a rim-sided section of the light-guide element an the related illuminant is arranged to radiate light into the cross-section of the lightguide element.
  • the light-incoupling section extends over the lateral, upper and/or lower rim of the light-guide element with respect to the intended mounting pose of the vehicle lighting device.
  • the vehicle lighting device can for instance be configured as a head light and its intended mounting pose in the front end of a motor vehicle defines the spatial designations.
  • the light-incoupling section may comprise a plurality of sub-sections spaced apart from each other and each be provided with one or more belonging illuminants.
  • the light-outcoupling section may comprise a plurality of sub-sections distributed over the light-guide element spaced apart from each other.
  • the light guiding inside the light-guide element is preferrably based on total reflection of light at the interface between the light-guide element and the surrounding.
  • the cover pane comprises a transparent component forming the light-guide element and an opaque component forming a cover element, wherein the cover element covers the light-incoupling section such that the light-incou- pling section is not visible from the outside in an intended mounting position of the vehicle lighting device.
  • the transparent component may for instance be formed of polycarbonat (PC) or poly(methyl methacrylate) (PMMA), which offer suitable light-guiding properties.
  • the outcoupling elements in the light-outcoupling section are arranged on the inner side of the light-guide element, i.e., on the side facing the interior of the housing.
  • the outcoupling elements form geometric scattering centres to scatter light towards and out of the outer side of the light-guide element.
  • the outcoupling elements may be formed as dimples, pyramids or other free-form bodies, or as dedicated surface roughness.
  • the outcoupling elements may be introduced either already during forming of the light-guide element or afterwards by an appropriate surface treatment, e.g., laser structuring, mechanical structuring, eroding, etching, printing or the like.
  • the outcoupling elements can be arranged on a carrier foil and applied together with this foil to the light-guide element.
  • the outcoupling elements may be arranged on the outer side of the light-guide element or on both sides, although the arrangement on the inner side advantageously offers the best wear protection.
  • the cover pane is formed as an injection molded part, especially as a multi-component injection molded part.
  • the embodiment featuring a transparent component forming the light-guide element and an opaque component forming the cover element may be produced by two-component injection moulding. Further components, e.g., components of different colour and/or of different degrees of translucency may be integrated as well, especially for design purposes.
  • the Figure shows a cross-sectional partial top view of a vehicle lighting device 100 according to the invention comprising the housing 1 , the plastic cover pane 2 covering the front opening of the housing 1 , and the two lighting modules 4, 5 accomodated in the interior of the housing 1 .
  • the vehicle lighting device 100 furthermore comprises the illuminant 3 with the lightemitting diode 31 on the printed-circuit board 32 configured to emit light L into the cover pane 2 via the rim-sided light-incoupling section 21 , wherein the cover pane 2 is configured in sections as the transparent light-guide element 2a featuring the light-out- coupling section 22 with outcoupling elements 23, such that the light L of the illuminant 3 is emittable from the light-outcoupling section 22.
  • the irradiation of the light L into the cross-section of the light-guide element 2a takes place via the narrow end face at the rim-sided light-incoupling section 21 .
  • the light-incoupling section 21 extends over the left lateral rim of the light-guide element 2a.
  • the propagation of the light L inside the light-guide element 2a towards the light-out- coupling section 22 is based on total reflection at the interface.
  • the light-outcoupling section 22 features the outcoupling elements 23 on the inner side of the light-guide element 2a.
  • the outcoupling elements 23 are exemplarily formed as half-spheres and are distributed in a dedicated pattern for homogeneous light emission.
  • the cover pane 2 comprises an opaque component forming the cover element 2b, wherein the cover element 2b covers the light-incoupling section 21 such that the light-incoupling section 21 is not visible from the outside in an intended mounting position of the vehicle lighting device 100.

Abstract

The invention relates to a vehicle lighting device (100) comprising a housing (1) and a plastic cover pane (2) covering the front opening of the housing (1), wherein the vehicle lighting device (100) comprises an illuminant (3) configured to emit light (L) into the cover pane (2) via a rim-sided light-incoupling section (21), wherein the cover pane (2) is configured at least in sections as a light-guide element (2a) featuring a light-outcou-pling section (22) with outcoupling elements (23), such that light (L) of the illuminant (3) is emittable from the light-outcoupling section (22).

Description

Vehicle lighting device
Description
The present invention relates to a vehicle lighting device comprising a housing and a plastic cover pane covering the front opening of the housing.
PRIOR ART
In modem motor vehicle lighting devices, light-guide components are frequently used, with the particular aim of creating a homogeneous light impression over a wide area. For this purpose, the light-guide components typically comprise a large number of expediently arranged outcoupling elements in the form of geometric scattering centers introduced into the surface, for example by means of surface structuring, etching or the like. Light is usually coupled-in via a section at the rim of the light-guide components, and light guiding is typically based on the principle of total reflection. Such lightguide components serve, for example, as daytime running lights, as direction indicators or also as design elements, pictograms, logos and the like.
For example, the document DE 10 2020 102 602 A1 discloses a lighting unit for a vehicle lighting device, comprising an elongated light-guide component in a holding device arranged behind the transparent cover pane of the lighting unit, the light-guide component being designed to couple-out light over its longitudinal extension and to form a required light signature along a bending line.
Furthermore, the document AT 520399 A1 discloses a vehicle lighting device, comprising an elongated light-guide component, an aperture and a plate-like light-guide component arranged one after the other behind the cover pane of the lighting device.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an alternative embodiment of a vehicle lighting device featuring appropriate light-guide means. This object is achieved by a vehicle lighting device as taught by claim 1 of the present invention. Advantageous embodiments of the invention are defined in the subclaims.
The invention relates to a vehicle lighting device comprising a housing and a plastic cover pane covering the front opening of the housing, and discloses that the vehicle lighting device comprises an illuminant configured to emit light into the cover pane via a rim-sided light-incoupling section, wherein the cover pane is configured at least in sections as a light-guide element featuring a light-outcoupling section with outcoupling elements, such that light of the illuminant is emittable from the light-outcoupling section.
The basic idea of the invention lies in the use of the plastic cover pane itself as the light-guide component of the vehicle lighting device. This eliminates the need for separate light-guide components as known from the prior art. The construction of the vehicle lighting device can thus be made more compact and there is greater freedom with regard to the technical configuration and design aspects. Moreover, the assembly process of the vehicle lighting device can be carried out more quickly due to the smaller number of components to be assembled with each other, which is a major economic advantage for mass-produced devices.
As with conventional vehicle lighting devices, the cover pane serves to protect the interior of the housing, in which the lighting modules are housed, from the ingress of water, dust, dirt and the like. In addition, according to the invention, it functions at least in sections as a light-guide element, i.e. , as a light-guiding and light-emitting component, for which purpose suitable light-incoupling and light-outcoupling sections must be provided.
The light-incoupling section is formed by a rim-sided section of the light-guide element an the related illuminant is arranged to radiate light into the cross-section of the lightguide element. In particular, the light-incoupling section extends over the lateral, upper and/or lower rim of the light-guide element with respect to the intended mounting pose of the vehicle lighting device. The vehicle lighting device can for instance be configured as a head light and its intended mounting pose in the front end of a motor vehicle defines the spatial designations. The light-incoupling section may comprise a plurality of sub-sections spaced apart from each other and each be provided with one or more belonging illuminants. Likewise, the light-outcoupling section may comprise a plurality of sub-sections distributed over the light-guide element spaced apart from each other. The light guiding inside the light-guide element is preferrably based on total reflection of light at the interface between the light-guide element and the surrounding.
As a preferred embodiment the cover pane comprises a transparent component forming the light-guide element and an opaque component forming a cover element, wherein the cover element covers the light-incoupling section such that the light-incou- pling section is not visible from the outside in an intended mounting position of the vehicle lighting device. The transparent component may for instance be formed of polycarbonat (PC) or poly(methyl methacrylate) (PMMA), which offer suitable light-guiding properties.
Preferrably, the outcoupling elements in the light-outcoupling section are arranged on the inner side of the light-guide element, i.e., on the side facing the interior of the housing. The outcoupling elements form geometric scattering centres to scatter light towards and out of the outer side of the light-guide element. The outcoupling elements may be formed as dimples, pyramids or other free-form bodies, or as dedicated surface roughness. The outcoupling elements may be introduced either already during forming of the light-guide element or afterwards by an appropriate surface treatment, e.g., laser structuring, mechanical structuring, eroding, etching, printing or the like. Alternatively, the outcoupling elements can be arranged on a carrier foil and applied together with this foil to the light-guide element. Furthermore, the outcoupling elements may be arranged on the outer side of the light-guide element or on both sides, although the arrangement on the inner side advantageously offers the best wear protection. Preferrably, the cover pane is formed as an injection molded part, especially as a multi-component injection molded part. For instance, the embodiment featuring a transparent component forming the light-guide element and an opaque component forming the cover element may be produced by two-component injection moulding. Further components, e.g., components of different colour and/or of different degrees of translucency may be integrated as well, especially for design purposes.
PREFERRED EMBODIMENT
Additional details, characteristics and advantages of the object of the invention are disclosed in the following description of the Figure - which in an exemplary fashion - shows a preferred embodiment of the invention. It is obvious to the person skilled in the art that the proportions in the Figure are not shown true to the original, but that they are purely schematic representations for the purpose of illustration.
The Figure shows a cross-sectional partial top view of a vehicle lighting device 100 according to the invention comprising the housing 1 , the plastic cover pane 2 covering the front opening of the housing 1 , and the two lighting modules 4, 5 accomodated in the interior of the housing 1 .
The vehicle lighting device 100 furthermore comprises the illuminant 3 with the lightemitting diode 31 on the printed-circuit board 32 configured to emit light L into the cover pane 2 via the rim-sided light-incoupling section 21 , wherein the cover pane 2 is configured in sections as the transparent light-guide element 2a featuring the light-out- coupling section 22 with outcoupling elements 23, such that the light L of the illuminant 3 is emittable from the light-outcoupling section 22. The irradiation of the light L into the cross-section of the light-guide element 2a takes place via the narrow end face at the rim-sided light-incoupling section 21 . With respect to the intended mounting pose of the vehicle lighting device 100, the light-incoupling section 21 extends over the left lateral rim of the light-guide element 2a. The propagation of the light L inside the light-guide element 2a towards the light-out- coupling section 22 is based on total reflection at the interface. The light-outcoupling section 22 features the outcoupling elements 23 on the inner side of the light-guide element 2a. The outcoupling elements 23 are exemplarily formed as half-spheres and are distributed in a dedicated pattern for homogeneous light emission.
In addition to the transparent component forming the light-guide element 2a, the cover pane 2 comprises an opaque component forming the cover element 2b, wherein the cover element 2b covers the light-incoupling section 21 such that the light-incoupling section 21 is not visible from the outside in an intended mounting position of the vehicle lighting device 100.
The present invention is not limited by the embodiment described above, which is represented as an example only and can be modified in various ways within the scope of protection defined by the appending patent claims.
List of Numerals
100 vehicle lighting device
1 housing
2 cover pane
2a light-guide element
2b cover element
21 light-incoupling section
22 light-outcoupling section
23 outcoupling element
3 illuminant
31 LED
32 PCB
4 lighting module
5 lighting module

Claims

Vehicle lighting device Patent Claims
1. Vehicle lighting device (100) comprising a housing (1) and a plastic cover pane (2) covering the front opening of the housing (1 ), characterised in that the vehicle lighting device (100) comprises an illumi- nant (3) configured to emit light (L) into the cover pane (2) via a rim-sided light-incoupling section (21), wherein the cover pane (2) is configured at least in sections as a light-guide element (2a) featuring a light-outcoupling section (22) with outcoupling elements (23), such that light (L) of the illumi- nant (3) is emittable from the light-outcoupling section (22).
2. Vehicle lighting device (100) according to claim 1 , characterised in that the light-incoupling section (21 ) extends over the lateral, upper and/or lower rim of the light-guide element (2a) with respect to the intended mounting pose of the vehicle lighting device (100).
3. Vehicle lighting device (100) according to claim 1 or 2, characterised in that the cover pane (2) comprises a transparent component forming the light-guide element (2a) and an opaque component forming a cover element (2b), wherein the cover element (2b) covers the light-incoupling section (21 ) such that the light-incoupling section (21 ) is not visible from the outside in an intended mounting position of the vehicle lighting device (100).
4. Vehicle lighting device (100) according to one of the previous claims, characterised in that the outcoupling elements (23) are arranged on the inner side of the light-guide element (2a).
5. Vehicle lighting device (100) according to one of the previous claims, characterised in that the cover pane (2) is formed as an injection molded part, especially as a multi-component injection molded part.
PCT/EP2022/050985 2022-01-18 2022-01-18 Vehicle lighting device WO2023138749A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2022/050985 WO2023138749A1 (en) 2022-01-18 2022-01-18 Vehicle lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2022/050985 WO2023138749A1 (en) 2022-01-18 2022-01-18 Vehicle lighting device

Publications (1)

Publication Number Publication Date
WO2023138749A1 true WO2023138749A1 (en) 2023-07-27

Family

ID=80034899

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/050985 WO2023138749A1 (en) 2022-01-18 2022-01-18 Vehicle lighting device

Country Status (1)

Country Link
WO (1) WO2023138749A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020093829A1 (en) * 2001-01-02 2002-07-18 Ghislaine Pinson Optical or styling component for a lighting or indicator device for a motor vehicle
DE10319162A1 (en) * 2003-04-29 2004-11-18 Hella Kgaa Hueck & Co. Vehicle lighting unit, contained within a housing, has a closure pane with an inwards projecting edge to carry an additional light on an optical axis parallel to the pane as a parking light
DE102013001027A1 (en) * 2013-01-23 2013-08-01 Daimler Ag Headlamp for vehicle, has cover plate with light passage surface for passage of light distribution
EP3361142A1 (en) * 2017-02-08 2018-08-15 Valeo Iluminacion Lighting device comprising an active lens and method for producing thereof
AT520399A1 (en) 2017-08-29 2019-03-15 Zkw Group Gmbh LIGHTING DEVICE AND / OR SIGNALING DEVICE FOR A MOTOR VEHICLE
DE102020102602A1 (en) 2020-02-03 2021-08-05 HELLA GmbH & Co. KGaA Lighting unit for a lighting device of a vehicle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020093829A1 (en) * 2001-01-02 2002-07-18 Ghislaine Pinson Optical or styling component for a lighting or indicator device for a motor vehicle
DE10319162A1 (en) * 2003-04-29 2004-11-18 Hella Kgaa Hueck & Co. Vehicle lighting unit, contained within a housing, has a closure pane with an inwards projecting edge to carry an additional light on an optical axis parallel to the pane as a parking light
DE102013001027A1 (en) * 2013-01-23 2013-08-01 Daimler Ag Headlamp for vehicle, has cover plate with light passage surface for passage of light distribution
EP3361142A1 (en) * 2017-02-08 2018-08-15 Valeo Iluminacion Lighting device comprising an active lens and method for producing thereof
AT520399A1 (en) 2017-08-29 2019-03-15 Zkw Group Gmbh LIGHTING DEVICE AND / OR SIGNALING DEVICE FOR A MOTOR VEHICLE
DE102020102602A1 (en) 2020-02-03 2021-08-05 HELLA GmbH & Co. KGaA Lighting unit for a lighting device of a vehicle

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